Q10 of 43 Page 26

Identify the Mg2+ ion from the Fig.4.1 where n and p represent the number of neutrons and protons respectively

Magnesium atom has 12 protons and 12 electrons. The Mg2+ ion, after the loss of 2 electrons has 10 electrons remaining in the outermost shell which is shown in (d).


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8

Rutherford’s α–particle scattering experiment showed that

(i) electrons have a negative charge


(ii) the mass and positive charge of the atom is concentrated in the nucleus


(iii) neutron exists in the nucleus


(iv) most of the space in an atom is empty


Which of the above statements are correct?

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The ion of an element has 3 positive charges. A mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

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In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

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Elements with valency 1 are